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Leica M Monochrom vs Leica M MONOCHROM (Typ 246): read noise comparison

Input-referred read noise at base ISO: Leica M Monochrom 13.3 e⁻ (ISO 320), Leica M MONOCHROM (Typ 246) 12.1 e⁻ (ISO 320).

Leica M Monochrom

The Leica M Monochrom was measured at 17 ISO settings from ISO 160 to ISO 10000. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (320) read noise is 7.52 DN, or 13.3 electrons at the sensor. From ISO 320 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 28,787 electrons; unity gain is around ISO 560.

Leica M MONOCHROM (Typ 246)

The Leica M MONOCHROM (Typ 246) was measured at 18 ISO settings from ISO 320 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (320) read noise is 0.97 DN, or 12.1 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 51,239 electrons; unity gain is around ISO 3970.

Leica M Monochrom vs Leica M MONOCHROM (Typ 246) read noise table

ISO	Leica M Monochrom	Leica M MONOCHROM (Typ 246)
160	7.568	–
320	7.516	0.973
400	9.318	1.021
500	11.713	1.133
640	13.833	1.357
800	17.148	1.404
1000	21.407	1.625
1250	27.284	2.071
1600	34.535	2.621
2000	42.814	3.340
2500	54.569	4.056
3200	69.071	5.134
4000	86.223	6.635
5000	109.896	8.515
6400	139.102	10.928
8000	173.645	13.642
10000	219.793	17.509
12800	–	21.857
25600	–	46.527

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